Granted Patent
Utility
US 4,891,518 · App. 07/087,872
Apparatus for detecting a plurality of gases
Inventor:
Stephen Day
Patented Case
View Patent ↗
Granted: Jan 2, 1990
Filed: Aug 21, 1987
Inventor
Stephen Day
Assignee (at issue)
Fox Boro Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.